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Valencia-Martínez H, Riaño-Umbarila L, Olamendi-Portugal T, Romero-Moreno JA, Possani LD, Becerril B. Neutralization of Centruroides tecomanus scorpion venom by the use of two human recombinant antibody fragments. Mol Immunol 2023; 164:79-87. [PMID: 37980772 DOI: 10.1016/j.molimm.2023.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 09/06/2023] [Accepted: 11/02/2023] [Indexed: 11/21/2023]
Abstract
The first toxic component identified against mammals in the venom from Centruroides tecomanus scorpion from Colima, Mexico was Ct1a toxin, which was neutralized by human single chain variable fragment (scFv) RAS27. Venom characterization from these scorpions collected on the Pacific coast of Colima, enabled the identification of a second component of medical importance named Ct71 toxin. Amino acid sequence of Ct71 shares a high identity with Chui5 toxin from C. huichol scorpion, which was neutralized by scFv HV. For this reason, the kinetic parameters of interaction between Ct71 toxin and scFv HV were determined by surface plasmon resonance. Results showed a significantly higher affinity for Ct71 as compared to Chui5. As expected, this toxin was neutralized by scFv HV. The injection of a mixture of scFvs HV and RAS27, resulted in the neutralization of C. tecomanus venom, corroborating that human recombinant antibody fragments can efficiently contribute to the neutralization of medically important toxins and their respective venoms from Mexican scorpions.
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Affiliation(s)
- Hugo Valencia-Martínez
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, Cuernavaca, 62250, Mexico
| | - Lidia Riaño-Umbarila
- Investigadora por México, CONAHCyT-Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, Cuernavaca 62250, Mexico
| | - Timoteo Olamendi-Portugal
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, Cuernavaca, 62250, Mexico
| | - José Alberto Romero-Moreno
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, Cuernavaca, 62250, Mexico
| | - Lourival D Possani
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, Cuernavaca, 62250, Mexico
| | - Baltazar Becerril
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, Cuernavaca, 62250, Mexico.
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Bermúdez-Guzmán MJ, Jiménez-Vargas JM, Possani LD, Zamudio F, Orozco-Gutiérrez G, Oceguera-Contreras E, Enríquez-Vara JN, Vazquez-Vuelvas OF, García-Villalvazo PE, Valdez-Velázquez LL. Biochemical characterization and insecticidal activity of isolated peptides from the venom of the scorpion Centruroides tecomanus. Toxicon 2022; 206:90-102. [PMID: 34973996 DOI: 10.1016/j.toxicon.2021.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 12/16/2021] [Accepted: 12/20/2021] [Indexed: 11/19/2022]
Abstract
The venom of scorpions is a mixture of components that constitute a source of bioactive molecules. The venom of the scorpion Centruroides tecomanus contains peptides toxic to insects, however, to date no toxin responsible for this activity has yet been isolated and fully characterized. This communication describes two new peptides Ct-IT1 and Ct-IT2 purified from this scorpion. Both peptides contain 63 amino acids with molecular weight 6857.85 for Ct-IT1 and 6987.77 Da for Ct-IT2. The soluble venom was separated using chromatographic techniques of molecular size exclusion, cationic exchange, and reverse phase chromatography, allowing the identification of at least 99 components of which in 53 the insecticidal activity was evaluated. The LD50 determined for Ct-IT1 is 3.81 μg/100 mg of cricket weight, but low amounts of peptides (0.8 μg of peptide) already cause paralysis in crickets. The relative abundance of these two peptides in the venom is 2.1% for Ct-IT1 and 1% for Ct-IT2. The molecular masses and N-terminal sequences of both insecticidal toxins were determined by mass spectrometry and Edman degradation. The primary structure of both toxins was compared with other known peptides isolated from other scorpion venoms. The analysis of the sequence alignments revealed the position of a highly conserved amino acid residue, Gly39, exclusively present in anti-insect selective depressant β-toxins (DBTXs), which in Ct-IT1 and Ct-IT2 is at position Gly40. Similarly, a three-dimensional structure of this toxins was obtained by homology modeling and compared to the structure of known insect toxins of scorpions. An important similarity of the cavity formed by the trapping apparatus region of the depressant toxin LqhIT2, isolated from the scorpion Leiurus quinquestriatus hebraeus, was found in the toxins described here. These results indicate that Ct-IT1 and Ct-IT2 toxins have a high potential to be evaluated on pests that affect economically important crops to eventually consider them as a potential biological control method.
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Affiliation(s)
- M J Bermúdez-Guzmán
- Facultad de Ciencias Químicas, Universidad de Colima, Km. 9 Carretera Colima-Coquimatlán, C.P. 28400, Coquimatlán, Colima, México; Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), Km. 35 Carretera Colima-Manzanillo, C.P. 28100, Tecomán, Colima, México
| | - J M Jiménez-Vargas
- CONACYT-Facultad de Ciencias Químicas, Universidad de Colima, Km. 9 Carretera-Coquimatlán, C.P. 28400, Coquimatlán, Colima, México
| | - L D Possani
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad, 2001, Colonia Chamilpa, C.P. 510-3, Cuernavaca, Morelos, México
| | - F Zamudio
- Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad, 2001, Colonia Chamilpa, C.P. 510-3, Cuernavaca, Morelos, México
| | - G Orozco-Gutiérrez
- Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), Km. 35 Carretera Colima-Manzanillo, C.P. 28100, Tecomán, Colima, México
| | - E Oceguera-Contreras
- Centro Universitario de los Valles, Universidad de Guadalajara, Km. 45.5 Carretera Guadalajara-Ameca, Ameca, Jalisco, México
| | - J N Enríquez-Vara
- CONACYT-Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco A.C., Camino Arenero 1227, Col. El Bajío C.P. 45019, Zapopan, Jalisco, México
| | - O F Vazquez-Vuelvas
- Facultad de Ciencias Químicas, Universidad de Colima, Km. 9 Carretera Colima-Coquimatlán, C.P. 28400, Coquimatlán, Colima, México
| | - P E García-Villalvazo
- Facultad de Ciencias Químicas, Universidad de Colima, Km. 9 Carretera Colima-Coquimatlán, C.P. 28400, Coquimatlán, Colima, México
| | - L L Valdez-Velázquez
- Facultad de Ciencias Químicas, Universidad de Colima, Km. 9 Carretera Colima-Coquimatlán, C.P. 28400, Coquimatlán, Colima, México.
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